ubrogden



May 7, 1940. M. L. BROGDEN HEATING sTovE Filed Dec. 5, 1938 4Sheets-Sheet 2 May 7,1940. M. LQBRoG-DEN 2.199.875

HEATING STOVE Filed Deo. 5, 1938 4 Sheets-Sheet 3 Mczxcyllee Brogcey n4rame@ Mayr,

NUNITD STATES PATENT; oFFIECE.

mme srovi:

Muay Lee Braden, columbia, S. c. 'Application December 3, 193s, serialNo. 243,838

11 claims.. (ci. :3c-ee) My invention relates to improvements in stoves.

An important object of the invention is vto provide thermostatic ,meansin the nature of an attachment, which may beapplied to a conventionalheating stove, without materially altering the construction of the same,and which will serve to automatically regulate the supply of air forcombustion.

A further object of the invention is to provide thermostatic means ofthe above mentioned character, which is extremely simple inconstruction, and so arranged that a portion of the solid thermostaticelement projects into the interior of the stove casing. c

A further object of the invention is to' provide thermostatic means foractuating the damper or air supply regulating element'which is mountedupon the movable door of the stove and which will permit of thefreeopening or closing of the door, without disturbing the operativerelation between the thermostatic means and the damper.

A further object of the invention is to provide means whereby a partoperated by the thermostatic means is separated from a part movable withthe damper, when the door carrying the damper is shifted to the openposition.

A further object of the invention is to provide an indicator for showingthe relative position of the damper.

Other objects and advantages of the invention will be apparent duringthe course of the following description.

In accompanying drawings forming a. part of this application and inwhich like numerals are employed to describe like parts throughout thesame:

Figure 1 is a perspective view of a stove embodying my invention,

Figure 2 is. a. central vertical longitudinal section of .the same,

Figure 3 isa. transverse vertical section taken on line. 3-3of Figure 2,

Figure 4 is a horizontal section taken online 4-4 of. Figure 2,

Figure 5 is an' elevation of the inner side of `the valve and capcarrying the same,

Figure 6 is a perspective view of a stove embodying a second form of theinvention,

Figure 7 is a' horizontal section taken on line 'If-"I of Figurev 6,

Figure 8 is a vertical section taken on line 8-8 oflElgure'Z,A f

`Figure 9 is a vertical section taken on line 9-9 of Figure 6,

Figure 10 is an elevation of the inner side of the ash door, damper andassociated elements,

Figure 11 is a perspective view of the damper, thermostatic element, andassociated elements, and,

Figure 12 is a perspective View of the indicator disk.

The present application is a continuation in part of my pendingapplication for Heating stove, iiled December 3, 1937 Serial No.178,004, allowed l0 November 4, 1938, now abandoned. y

In the drawings, arranged for thepurpose of` illustration, are shownpreferred embodiments of my invention, attention being called rst toFigures 1 to 5 inclusive, the numeral 5 designates the 15 casing-'orbody portion-of a heating stove, designed for/fburning wood,l althoughthe invention; is not restricted to a wood burning stove. The casing 5is ordinarily formed of sheet metal and is supported by legs 6 and hasthe usual coupling 20 or fitting 'I at its with the usual pipe.

Rigidly connected with the front end of casing forward end, forconnection 5 is an air supply sleeve or tubular housing 9;

This sleeve is preferably cylindrical and prefer- 25 ably has itslongitudinal axis arranged at a slight inclination from the horizontal.The inner end of this sleeve is in free communication with the interiorof the casing 5. The outer end of the sleeve 9 isadapted to be coveredby a cap, closure 30 element or door I0, hinged thereto at vits top, asshown at il, and the cap, closure element or door, is held in the closedposition by a sprng. catch I2. This spring catch engages over a iiangeI3 formed uponl the sleeve9 and the cap or door 35 has a. flange I4 toreceive the ange I3, so that. the cap or door has substantially an,air-tight it with the sleeve 9, when the cap is' closed. The cap or dooris provided to regulate the supply of air into the casing 5 to supportcombustion, and. 40-

for this reason the cap or door has segmental openings, I5, adaptedtoregister-with openings II formed in a pivoted valve I1, arranged uponthe outer side of the c ap or door. By turning the valvev I1 theopenings I5 may be partly 45 or completely-covered or closed. 'Ihe stovethus described is that of the usual 'or kconventional wood burningstove. l f

In accordance with my invention, I provide a vertically swinging valve,damper, or disk l8, 50

which is arranged within the sleeve S and.v is hinged to the cap or doorI0, as shown at ISLk The valve or damper I8 is of a suitable diameter tocover the segmental openings I5. The cap or door III is verticallyinclined on account of u of the housing 28 is a horizontal rock-shaft2l,

the inclination oi' the sleeve 9, and when the valve or damper I8 isreleased, and since it is pivotally supported at its top, it will movefrom the cap or door I3 to assume a vertical position and hence becomespaced from the cap or door and thereby open or uncover the segmentalopenings I5, permitting the airr to enter the casing 5 to support thecombustion. However, this air will be carried to a considerable extentdownwardly about the lower portion of the valve or damper I8.

'Ihe numeral 28 designates a vertically arranged housing, securedvto thecasing 5 by rivets or thelike. This housing is arranged exteriorally ofthe casing 5 and above and adiacent to the sleeve 9. Mounted within theupper end to which is attached a solid thermostatic elev ment 22,whichis straight at low temperatures.

has no connection with the valve or damper I8.-

It is thus seen that when the cap or door I8 is opened, the valve ordamper I8, being unconnected with the nger 23 moves from th'e same,without disturbing the thermostatic element.

Adjustable means are provided to regulate the starting angular positionof the bar thermostatic element 22, comprising a rod 24. havingscrewthreaded engagement with the housingV 28 at 25. The rod is turnedby a knob 26. The inner end of the rod has swiveled connection with thebar thermostatic element 22, which is effected by providing the bar 22with an elongated slot 21, to receive the rod 24 and spacingsleeves 28upon the rod 24, upon-opposite sides oi the bar 22, these sleeves beingclamped to the rod. 'I'he bar thermostatic element 22 extends through aslot 29 formed in the top of the sleeve 9.

It is thus s'een that I can apply my thermostatic device upon the stovewithout materially altering the construction of the same.

The numeral 38 designates a guard or plate which I prefer to attach tothe interior of the casing 5 so that this guard will extend over theupper portion of the bore of the sleeve 9 and cover the thermostatic barelement 22 and its nger. This guard will prevent wood or the likecontacting with the thermostatic element and serves to retain .thesleeve 9 free and unobstructive.

In operation, when the stove is relatively cool, the valve or damper I8is in the vertical open positionand air is drawn into the casing 5through the openings I5 and passes about the edge of the valve I8 andenters the lower portion of the casing 5. As the combustion increasesthe bar thermostatic element 22 is heated and bends, moving the finger23 ytoward the valve or damper I8, which in turn moves this valve ordamper toward the openings I5 until the openings are covered to cut of!the supply of air. The degree of heat necessary to completely close the.valve or damper I8 will depend upon the starting angular. position ofthe bar thermostatic -element 22.

. the'inner side of the door member 52.

mounted upon the jacket 31.

vor room'heating st'ove or furnace. This stove embodies -an inner casing36 andan outer Jacket 31, spaced from the inner casing and ailording to12 inclusive, r have shown a second modification of the invention. Inthese an air chamber 36', for the circulation of Th'e air enters at thbottomof this chamber and discharges from its top. 'I'he inner casing36, at its top, discharges the product of combustion into the Ausualpipe 38. Numeral 39 designates the door for the introduction of fuel,such as coal, the usual grate being provided, below which is ahorizontally swinging ash door 48, hinged at 4I.

This ash door is provided with Il a draft opening 42, the area of whichis regulated by an adjustable valve or damper 43, adapted to be clampedin the selected adjusted position by means of a bolt 44 or the like. The

draft opening 42 discharges air into the ash pit 80 below the usualgrate and the opening 42 is ver-l tical. A housing 45 is arranged uponthe inner side of the horizontally swinging door 48 and is attachedthereto by screws 46 or 'the like. 'Ihis housing may be formed of sheetmetal or other suitable material and has a vertically inclined side wall41, extending inwardly in an upward direction. This side wall 41 has adraft f opening 43, adapted to be covered and uncovered by a valve ordamper 49, hinged at lits upper end, as shown at 58, with the side wall41. The valve or damper 49 automatically gravitates to the verticalposition .to uncover the draft opening 48, but will cover this draftopening when swung toward the side wall 41.

The door 48 covers the opening which leads into the ash -pit of theinner casing 36 and this door 48 has an outwardly projecting sleeve ortubular portion 5I, having the opening 42 therein. This sleeve extendsthrough an opening formed in an outer door member 52, movable lablebolt55, arranged to contact with the inner side of the valve or damper 49,but free from connection therewith. The rock-shaft is `fournaled inopenings formed in the ends of the sleeve or tubular portion 5I and thisrock-shaft isjconnected with a second rock-shaft 56 by means ofV auniversal joint 51. The rock-shaft 56 is journaled'in a bracket 58,mounted upon The with 'the door 48 and serving to cover the ashrock-shaft 56 is provided at its free end with an upstanding crank 59,arranged within the space .36'. Clamped to the rockshaft-56 adjacent tothe vertical crank 59 is a horizontal crank 68,

carrying a pin 6I.

The numeral 62 designates a vertical supporting strip, arranged withinthe space 36', and

` 'I'his supporting strip 62 is stationary andl carries a horizontalstationary bracket 63, upon which is pivoted at- 64, a. oar`thermostatic element 65.y 'I'his bar thermostatic element is made ofstrips of metal having diierent coemcients of expansion, and

will bow inwardly, when heated. Rigidly attached to the lower end of thebar thermosatic element 65 is a rod-,65, having a horizontal crank 61 atits free end, carrying a roller 68,- arranged in advance of theupstanding crank 59 and in a position to engagetherewith.: At'its'upperend,

the thermostatic element 65 is rigidly connected with an arm 69, whichis forked and has pivotal connection with a block 18, in turn having ascrew-threaded opening for receiving the screwthreaded portion 1I of anadjusting rod 12. This adjusting rod is rotatably mounted within anopening formed in a bracket 13,- rigidly attached to the verticalsupporting strip 62. The rod 12 is provided with' collars 14, clampedthereto for holding the rod 12 against longi- 'tudinal movement. The rod12 extends to the exterior of lthe jacket 31 and is provided with a knob15', for turning the same. It is thus apparent that by turning the rod12 'the starting angular 'position' of the thermostatic element 65A maybe selected and the thermostatic element will thereafter be held in theselected position.

The vertical supporting strip 62 is provided near its lower end withhorizontal apertured ears 15, to receive a verticalreciprocatoryindicator rod 16, provided at its lower end with a cam 11, arrangedabove and contacting with the pin'6l. Rigidly attached to the upper endof the reciprocatory rod 16 is a connecting link 18, pivotally connectedat 19 .with a segmental gear 80, mounted upon a iixed pivot 8|. The rod16 is sumciently resilient to permitv the same to move laterally, due tothe turning movement of the segmental gear 80. This segmental gear is inpermanent mesh with a smaller gear 82, mounted upon a rock-shaft 83,supported by the strip 62. An indicator disk 84 is rigidly mounted uponthe rock-shaft 83 and is provided with designations 85, indicating thatthe damper 49 is opened or closed, or partly so. A stationary pointer 86is arranged to cooperate with the scale or indications 85. The indicatordisk isrpreferably provided with a radially extending weight 81.

The operation of the second form of my invention is as follows:

With the thermostatic bar element65 in the adjusted position shown, andthe valve or damper 49 gravitates to the vertical open position, air isadmitted to the ashl pit, and the coal or other fuel is burning. As thestove heats up, the bar thermostatic element 65 is bowed inwardlydrawing rod 66 inwardly so that roller 68 engages the upstanding crank59 and swings it inwardly.

This crank 59 then turns the rock-shaft 56' counter-clockwise, Figures 9and 11, turning rock-shaft 53 counter-clockwise.. This rockshaft swingsthe crank 54 toward the valve or damper 49 and the valve or damper ismovedv toward the opening 48-to cover the same in whole or in part. Whenthe damper 49 is in the vertical open position, the indicator disk 84 ispoturns the segmental gear 80, which turns thegear 82 in an oppositedirection, and the indicator disk 84 is turned to cause the C to traveltoward the pointer 86, indicating that the damper is closed in part orin whole. Particular attention is called to the fact that the verticalcrank 59 contacts with.the roller 68 but is not connected therewith.When it is desired to have accesss to the ash pit, the door 40 may beswung to the open position, and the crank 59 will be swung from theroller 68. The door may therefore be opened without disturbing the barthermostatic element.

, In both forms of the'invention the valve or damper is carried by ahinged or pivoted cap or door. The valve or damper is'self-opening andgravitates to a vertical open position. This is the preferredarrangement but it could be opened by means of a spring instead ofgravity, if desired. In both forms of the invention the bar thermostaticelement serves to close the valve or damper but is not connectedtherewith and the cap. or damper may be swung to the open positionwithout disturbing the bar thermostatic element.

It is to be understood that the forms'of my invention herewith shown anddescribed are to be taken as preferred examples of the same and thatvarious changes in the shape, size, and arrangement of parts may beresorted to Without departing from the spirit of my invention or thescope of the subjoined claims.

Having thus described by invention, what I claim is:

' 1. A stove comprising a casingprovided with an outlet for the productsof combustion, an air inlet collar connected with the casing, a cappivotally mounted at its upper end upon the collar and verticallyinclined in an upward direction toward the casing when in the closedposition, a valve arranged upon the inner side ofthe cap and pivotallymounted near its upper end upon the cap to move from the inclined cap bygravity, and a solid thermostatic bar element arranged in proximity tothe casing and having a part to contact with the valve to swing the sametoward the cap for cutting off the supply of air, the thermostatic barelement and the valve being separable so that ,'the valve moves upwardlywith the cap and with relation to the thermostatic bar element when thecap is swung upwardly.

2. A stove comprising a casing provided with an outlet for the productsof combustion, an air a valve arranged upon the inner side .of the capand pivotally mounted at its upper end to the cap; the valve movingtoward a vertical position by-the action of gravity to become spacedfrom the cap, and a thermostatic bar arranged adjacent to the casing andhaving a part extending into the collar to engage with the valve toswing the same toward the cap.

3. A stove comprising a casing provided with an outlet for the productsof combustion, an air inlet collar arranged -exteriorly of the casingand attached thereto, a cap mounted upon the outer end of the collar andinclined vertically in an upward direction toward theV casing and havingan air inlet opening, a valve arranged within the collar and upon theinner side of the cap and vpivotally supported at its upper end to swingby gravity toward a vertical position to become spaced from the cap, anda thermostatic rod supported near the casing and projecting into thecollar. and having a part engaging the pivoted valve to swing the valvetoward the inclined cap.

44. A stove comprising a casing having an outlet for products ofcombustion, an air inlet collar mounted upon the exterior of the casing,a cap mounted upon the outer .end'of the collar and inclined upwardlytoward the casing, a valve pivotally supported at its top to move bygravity 'the cap, a substantially vertical thermostatic bar arrangednear and above the collar and -having a part arranged to engage with thevalve and swing the valve toward the cap, means to pivotally sup-.toward a vertical position to become spaced from l port thethermostatic bar at its upper end, and means to angularly adjust the barand hold the same at the selected adjusted position.

5. A stove comprising a casing having an outlet for the products ofcombustion, a horizontally swinging door connected with the casing andhaving an air inlet, a self-opening damper pivotally mounted upon thedoor to control the passage of air through the opening, a rock-shaftmounted upon the horizontally swinging door for moving the damper towardthe closed position and having a crank, a thermostatic bar supportednear the casing, a rod connected with the thermostatic bar and having apart to contact with the crank and being free from connection therewith,the part being arranged upon that side of the crank which is forwardlyof the direction of movement when the crank is moved inwardly due to theopening of the door so that the crank and the part are separated whenthe door is opened.

6. A stove comprising a casing having an outv let for the products ofcombustion, a horizontally swingingl door connected with the casing andhaving an air inlet, a self-opening damper mounted upon the door tocontrol the passage of air through the opening, a generally horizontalvrockshaft mounted upon the door for moving the damper toward the closedposition and having a crank, a thermostatic bar supported near theca'sing, a rod connected with the thermostatic bar and having a part tocontact with the crank and being disposed upon the outer side of thecrank so that the crank is separated from the part when it is movedinwardly due to the opening movement of the door.

'1. A stove comprising a casing having an outlet for products ofcombustion, a horizontally swinging door connected with -the casing andhaving an air inlet, a damper mounted upon the door to control thepassage of air through the opening, a generally horizontal rock-shaftmounted upon the door for operating the damper and having a crank, thecrank moving inwardly when the door is opened, a thermostatic barmounted havlngan air inlet opening, aY movable damper mounted upon thedoor to control the passage' of air through the opening, aA generallyhorizontal rock-shaft mounted upon the door and serving to operate thedamper, said rock-shaft having a 5 from the part by the opening movementof the 10 door, and an indicator device operated by the rock-shaft.

9. A stove comprising a casing having an outlet for the products ofcombustion, a horizontally swinging door for the casing having an airinlet opening, a. movable damper for controlling the passage of airthrough the opening, a generally horizontall rock-shaft mounted upon thedoor and serving to move the damper, a generally vertical thermostaticbar arranged near the casing, a rod connected with the thermostatic bar,means effecting an operative connection between the rod and rock-shaft,means to pivotally support the thermostatic bar, and means to angularlyadjust the thermostatic bar.

l0. A stove comprising a casing having an outlet for products ofcombustion a horizontally swinging door having an air inlet opening, adamper to control the passage of air through the opening, a rock-shaftmounted upon the door and serving to operate the damper, a thermostaticbar supported separate from the door and arranged near the casing, meansoperated by the thermostatic bar to turn the rock-shaft, an indicator,

and means operated by the rock-shaft to actuate the indicator. y

1l. A stove comprising a casing having an outlet for the products ofcombustion, an air inlet collar mounted upon the exterior of the casing,a member carried by the collar and extending across the bore of thecollar, said member having an air inlet opening, said member `beingvertically incli`ned in an upward direction toward the casing, a valvearranged within the collar upon the inner side of the member andpivotally mounted at its upper end upon the member, the valve movinginwardly to a vertical position by the action of' gravity to becomespaced from the member to un' cover the opening,l a thermostatic bararranged adjacent to the casing, and a device operated by thethermostatic bar, said device extending into the collar behind thevalve. and contacting with the inner face of the valve to swing the sameoutwardly toward said member.

MAXCY LEE BROGDEN.

